Difficulty using the tracker in Motion

The shot: hand-held shaky POV footage of walking down an alley and up to a steel door. I want to add the text: "Stage Door" to it using Motion's tracking features, but something is weird: in the online demos I watch, once you click on the track, a small cursor box opens up that you can direct to a tracking point. That box thingy never materializes for me, no matter what I try.